| /** |
| * Copyright The Apache Software Foundation |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.bookkeeper.bookie; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.Unpooled; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * An entry Key/Value. |
| * EntryKeyValue wraps a byte array and takes offsets and lengths into the array to |
| * interpret the content as entry blob. |
| */ |
| public class EntryKeyValue extends EntryKey { |
| private final byte [] bytes; |
| private int offset = 0; // start offset of entry blob |
| private int length = 0; // length of entry blob |
| |
| /** |
| * @return The byte array backing this EntryKeyValue. |
| */ |
| public byte [] getBuffer() { |
| return this.bytes; |
| } |
| |
| /** |
| * @return Offset into {@link #getBuffer()} at which the EntryKeyValue starts. |
| */ |
| public int getOffset() { |
| return this.offset; |
| } |
| |
| /** |
| * @return Length of bytes this EntryKeyValue occupies in {@link #getBuffer()}. |
| */ |
| public int getLength() { |
| return this.length; |
| } |
| |
| /** |
| * Creates a EntryKeyValue from the start of the specified byte array. |
| * Presumes <code>bytes</code> content contains the value portion of a EntryKeyValue. |
| * @param bytes byte array |
| */ |
| public EntryKeyValue(long ledgerId, long entryId, final byte [] bytes) { |
| this(ledgerId, entryId, bytes, 0, bytes.length); |
| } |
| |
| /** |
| * Creates a EntryKeyValue from the start of the specified byte array. |
| * Presumes <code>bytes</code> content contains the value portion of a EntryKeyValue. |
| * @param bytes byte array |
| * @param offset offset in bytes as start of blob |
| * @param length of blob |
| */ |
| public EntryKeyValue(long ledgerId, long entryId, final byte [] bytes, int offset, int length) { |
| super(ledgerId, entryId); |
| this.bytes = bytes; |
| this.offset = offset; |
| this.length = length; |
| } |
| |
| /** |
| * Returns the blob wrapped in a new <code>ByteBuffer</code>. |
| * |
| * @return the value |
| */ |
| public ByteBuf getValueAsByteBuffer() { |
| return Unpooled.wrappedBuffer(getBuffer(), getOffset(), getLength()); |
| } |
| |
| /** |
| * Write EntryKeyValue blob into the provided byte buffer. |
| * |
| * @param dst the bytes buffer to use |
| * |
| * @return The number of useful bytes in the buffer. |
| * |
| * @throws IllegalArgumentException an illegal value was passed or there is insufficient space |
| * remaining in the buffer |
| */ |
| int writeToByteBuffer(ByteBuffer dst) { |
| if (dst.remaining() < getLength()) { |
| throw new IllegalArgumentException("Buffer size " + dst.remaining() + " < " + getLength()); |
| } |
| |
| dst.put(getBuffer(), getOffset(), getLength()); |
| return getLength(); |
| } |
| |
| /** |
| * String representation. |
| */ |
| @Override |
| public String toString() { |
| return ledgerId + ":" + entryId; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| // since this entry is identified by (lid, eid) |
| // so just use {@link org.apache.bookkeeper.bookie.EntryKey#equals}. |
| return super.equals(other); |
| } |
| |
| @Override |
| public int hashCode() { |
| // since this entry is identified by (lid, eid) |
| // so just use {@link org.apache.bookkeeper.bookie.EntryKey#hashCode} as the hash code. |
| return super.hashCode(); |
| } |
| |
| } |